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MapX: 2D XRF for Planetary Exploration - Image Formation and Optic Characterization

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Published 17 April 2018 © 2018 IOP Publishing Ltd and Sissa Medialab
, , 24th International congress on x-ray optics and microanalysis (IXCOM24) Citation P. Sarrazin et al 2018 JINST 13 C04023 DOI 10.1088/1748-0221/13/04/C04023

1748-0221/13/04/C04023

Abstract

Map-X is a planetary instrument concept for 2D X-Ray Fluorescence (XRF) spectroscopy. The instrument is placed directly on the surface of an object and held in a fixed position during the measurement. The formation of XRF images on the CCD detector relies on a multichannel optic configured for 1:1 imaging and can be analyzed through the point spread function (PSF) of the optic. The PSF can be directly measured using a micron-sized monochromatic X-ray source in place of the sample. Such PSF measurements were carried out at the Stanford Synchrotron and are compared with ray tracing simulations. It is shown that artifacts are introduced by the periodicity of the PSF at the channel scale and the proximity of the CCD pixel size and the optic channel size. A strategy of sub-channel random moves was used to cancel out these artifacts and provide a clean experimental PSF directly usable for XRF image deconvolution.

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10.1088/1748-0221/13/04/C04023